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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5b772579b72aeab8cc902dc900229f2502064b2e175fc3d3c1e1c0fa41cb9f' 
  AND token = 'kUKevFo1wxqiUyZPutZoyfTm5JfrORFO3KrAm8tUl4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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