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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17eed0de4b78425306cddd4fafd497cbb3c99e81aa2d3352576a86911ed02e5c' 
  AND token = 'WT0Qui5k35fa0RZ6Xw+hbRBd6S7NY/1HKQnYIvag2/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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