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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e530c4be6c1a41e65d6f09609177eb5b893c08ad8fc007c54e7142bcbd123f' 
  AND token = '2mgX2qGuyGZdfcUzpIlt80N/uFTditmcyBplqv2/6e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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