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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b06c40ed8b3f14766e720370cace7cfd48f68f7334cbc51c00f41e9ddd39f52' 
  AND token = 'p0ss4LuZJS4cf1bJZ4wd8/LYNjXlqonv9CrSF4Z6Qt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01572

JSON explain

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