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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7d33d6ca8972d901c6d23bf800ba69f5d966451cdb44c7d44454a8b3fe41f0' 
  AND token = 'rLfUlKqyNHabRXkKbK+qF/xrE6vK5iZbT5QQO03kPlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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