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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a17e8cc05adb3b3ee71342fea3a5c62ceca7a690d8043ddea9408f1b90946f4' 
  AND token = 'f8vh8Okh1iJC8O1w6XKB9IarMYoe8N8ZbiSjWuEI9GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00179

JSON explain

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