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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c804bc2c0f9c01a86e1d1420f2795c817ccc838423b329a2e792dafe8f4a04' 
  AND token = 'aV1aZ3/IE2nFz30pmNqFkx+HPPv5QUTMQox3FKicuQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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