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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0de88f4a3ef02bcc62a68c963d8028583b0fd948a14a4d46b885910b69a21b6' 
  AND token = 'aqH3aQZQeUojonswjsgp5lByPbMEjdGB/PXd93VirnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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