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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73ed4cabc237557f47f04d89bb8481dbbbe482df479dbf4d775743697da28a3' 
  AND token = 'IkQ0rW85Y/53kg926M1iqyt7XDQ2GSe9y5LUvMLnSm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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