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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d52c85baa858ede75dfbda9bfddf05b53e7cc9afe29578ab4b2daa3103badf2' 
  AND token = 'wBnBXsqPpTT0KlaO25FPMjn2mtCsi8pSfijFvInbi3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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