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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4604b9c3d2d65d049141e88ea8733c5c074a8e9789226822f4367acf2e7d9067' 
  AND token = 'Y30fkCGZ8sEfWjYqDWsSbIYn3uNnTyBcx9x0uVOIx9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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