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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4277d5a7e69d250d161aafad466dd0182e4def5349b44ec01510b448d7ae0b37' 
  AND token = 'TzolJ5u+B0wqmJPgWPJXcBb7u6cd7YTI9JLZrORwc30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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