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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076ac44faea41782b27a98bbd8b06f31e428b7c5b95ac84f820051af8ae4fa3f' 
  AND token = 'Zy88U8pnuzhVetryaMHUC8I0hmDiBDxn++3ypHoS5EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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