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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4a7dd84f2f1086c87471aeab43aacbd65c238d707ced83b28ad988005dbbc2' 
  AND token = 'o+Zi8sOfsmS2MSi6fJHZo3C/po02/cv0m+tl6m91iDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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