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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812cc35303724cff106c3df7e7bb13d7bf08d29ef8a920461cec82f6a2210157' 
  AND token = 'o8tfTgLsMyccA24aMejq/Dsdgz8KYiTa4OGWPJuMGB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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