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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232ced072a81b59f92972f64bc684e2cdd4e262aa747f639e1ddcf6944ff2d48' 
  AND token = 'voGJiL8yYRGlA7ZoZmh4Twz2DsMImsUxipcL7g96LoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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