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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0158ac0a3f7c3f36652893ec276a877fd64620eaa79408e289c7c9623a50c995' 
  AND token = 'o+0PvP/Y4fOE1yJS8Xrrx7AIPrwHWVi0U41L/QWzzEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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