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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcda521abb6c1866c504b7995553ebd516b368eef8a63e2157b2742ff25217e4' 
  AND token = 'n9zb4d5NT0ED8FNgHFubKQYYT3pU1zGlg7CjjGgQikA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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