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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f37c79a94cdaa9cf79437d8b6d86cc58c5903f959220cd08576bba2ffd6fd83' 
  AND token = 'a7QnIULQhWlJtDjs53hJwf57amhqvDIy2AfCGOYpF4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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