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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e8337feb62783ba4bd809be44644c50941bf4ddddb3082f4345094d6fdda98' 
  AND token = 'lpNqodFG523xEq28TVhZAr0SA+fdt64cO7QWAVtyNto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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