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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1361725a68170a84d3c5340ed6bf7e4e5675c8cce62f80360af0188de612d17' 
  AND token = 'pPdLLdgAFivKOtah6Cj6hni62CXE2ntoI70c8QtBkxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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