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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7011140192ffa95e8745729dc2d701bc5f8a01ef0a74204a781677dd0e177a76' 
  AND token = 'aTp1DdfYHfpJTktlYI6pZR6q6SLXpb0nJXGyEY/uWHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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