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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdf3b4d91446f09367d08976864723187293399da70a9a2789d3e9b773aaa2e' 
  AND token = 'hLyHhGSX/eA/PBZtcLv1thkxN1KM0YDxv3WM8Uvsd6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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