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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c4c3934ab225be57d27e72da5a19f997de94be5b6c9ebfd97245c0a0dc3de4' 
  AND token = 'mv50Hfg04K8dCci1jAv17Vsl73n+b5GoB4wTW0FmkKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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