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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c4e86f3760af28869e7b317cef336f6b541a72e147fb75af7a56298ada4bf4' 
  AND token = 'XJfDvTN70OazklLD4oUo1XOYOY6IDSNp4Tfxdaqc+IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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