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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db3e28862d0b22650abf5de70e1762b16ee3da0f702c544b5d06bdfcd09d5f9' 
  AND token = 'G5mDw44RiGAPlCT10pHVIm3DVv/CoQNsd/oeQmmYnpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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