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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece38a2ac5a1a84616e9c79c183363a4a6e6a5b2c9daddc1df9dfe14975453ac' 
  AND token = '/wGgEIbmSM3N0TY2nrOO3FB+Cpp5RPtuwIsCR6PonI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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