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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06498af33ea95169cace18b7e69300a5ce5be7988035951cbe9cf848e2df3219' 
  AND token = 'TzJ3Qg/JHl05HEZCR8eA7jgm8up2J9f2ruZxFKkLK7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}