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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6306fb3b05f408d9f6a1277a705ed724cdfbc29ef574b61c822ac6aee004a0' 
  AND token = '9iRXcxj1GqRS3RV+IdR/bTRzGVNURznrBdAe6L0RAIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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