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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f525f200ed943218f59f01c0f8563291930d4dd25ee01c75f761e17d5302042' 
  AND token = '4avxr01p/38TnLOrH9cFR3vGCOwZ71KpmfAWFyNGp/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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