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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820edf2b94dcd548f96d47ce42df1fb659988cc977e740b78cc136290cf2b41d' 
  AND token = 'dUX8MvPW+NafvFOjULY3FeLfj5j2shqqlqaqhc6C/5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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