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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192e6d6f11003d76bb6cddf6ee08ed79cded8b2050fbbb7c8dabcc65d9f49530' 
  AND token = 'iQsNO3vQDOlJssPs0I0s+HIgd98Za8A2/C4NJa/DYMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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