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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7bd71ef02139743e31571fc5fb2a425db494ea0299b26857df66f1c963f72f' 
  AND token = 'nO9sRUM9E4314Dmtg4Svg4/T+tuQr+JupQuC4hqzjn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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