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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b270921fe5f23ac07164033fb7a7830bb220e00dbf0ec8f8cb77600555872858' 
  AND token = 'HTclZJ1cairZ8PvGYw5mfW8Cvm7zJi47DODfIW4HutY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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