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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58ac47d505867c5cd92e40d44885df01f4a93ee2590417659624ee7200c1871' 
  AND token = '57LjEctMEddtsD/B/QRsKzRc7XVb9QvsgRllQ7arwbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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