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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5afbe443096020c3e5812a10052111028516e78651b9df5bf7229dc0084840c8' 
  AND token = '1m3EO8HpzxPFKTpmNOdKqYM/+wUbug9W7tk9eDlqdNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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