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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee2345c0922ae7c5c28c7d433f2d841f43bd10b50e3d1f237d4d670a5c82eb5' 
  AND token = '7I8xFXHVjSPxYls3iV9bJ8u6bsA80uEary38bmuJHvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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