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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8629b92c303471f42417f05743dc198be4b888f31a31fbd0110112c8164121dc' 
  AND token = 'O1yO+ONVhR6d6msjk/uVu4t/8GdPW8LEGBbVV2VuWeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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