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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ebd2c004be28aa99a2b64c5a845c833a0bbf0bf8128c64dab31605c33fb68e' 
  AND token = 'jgIdNQRTtzFh9/adLf5x5pFgf+HvKq1S4Znq9Gz3Of4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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