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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802d13c72b7bc952288cd0dbc57966b0a72c1973367d238f6b73b6c9cbb7e0e5' 
  AND token = '7VYV3cTWZ80/a/fCk9m/8MKX2iFY8jOp4b8f1S6YxBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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