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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44bfcbef4944193d99c7679ce65237243275c829a6af6975ed2b69dfc91a3e3' 
  AND token = '6lgfLI8QWnHKua7rZ5HcAVpOvX3SWMrH3f/2/oyRzgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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