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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4876f533432d15235dd4e9aecc1bc78687e0648a1fd376f8a9c5e3b3b5e2c2fa' 
  AND token = 'P5s01AK1jPDsDNV8EIKNPablL7YX4X02on9kd0qE8gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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