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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff52f4df9279743f231cef92745c0995b1e07f1f90d244dafd00e13ff3ba5c2c' 
  AND token = 'Ub0WCwJ0P8iYk4we7Z9YEMlt6B7I1h5XFoIOOKN17rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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