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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac795b92e6698961dde085a3932ee6e9babea6731fc9717c8d95f6c640703e9' 
  AND token = 'PiJFkIKbk4WnXtetj6hLa/qKcXx16BcWIr/Y90q/0wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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