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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eacdb86f4d8e6d39a766264c38ad6e059fa7be8b27c3e8c46f24a5df704db1f' 
  AND token = 'BuPf5kAsWC1dwQJjpUUh0KUzoMOmEi8W93mUqAvTQPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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