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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd517e6a95ba41a5441c0b5e8e4be0bcbdefd7acb09ee37389cfabd0eed16ae9e' 
  AND token = 'QPqpRlp308J2eddBF9QRwGhsJdkTIur0PD6XuoBMaok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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