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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae86dad242a438e7b574f986b014342c59cef272e8de1da8026e952f6bbe97a3' 
  AND token = 'c/RTOmcreGZLXzNwA+yvFYoLApgTxHXUdXi93QnyRl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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