SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b95f6218b7b1d9ee4948f6fc938623c7dbff159fc283d18e0828cdf02199196' 
  AND token = 'hE1Qjx5++nQEqlv6lwrSDNrCq/nZL6NxBd+oCCmcWQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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