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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a044353a6796121b0154de92e9b2a45e0409270d027f2a6199576bc849d93074' 
  AND token = 'x0DbHA/euLklQ4Wpee963O289X3lr36GP5irN87Blj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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