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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e85e94d2c4a1e2ed1d7615721250d67663447c6aac172a87c56af0362072f9' 
  AND token = 'M7aeixS+Kw1tjNC03cDignB2eplSVF1kvNgwdZx4M5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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