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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce34cafcfd168cc819fd4e8598f12d71ac46b700930507a8f05ed9d6bafd23b5' 
  AND token = 'Svn1iUi6/myxtMY+yYPV6BwJ2RdJis45fEbDEzR9Eps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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