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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c299cb629458b39c2451035f7b9781b336c0df349c1aa883daf89e3894276d73' 
  AND token = 'Tqkdqslh3mHG0St2m48czB28AOlGib1LdyGV+2uBtjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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