SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7811db52e9d002d1f9427e80e235df76eec2fa42e598ef8070794e55d7e92002' 
  AND token = 'xZ5qwgdw4RLvrC14iRSWP+T0tS4Mu/qBjBtWJB5w8fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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