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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216fa7244e04f510381683e88560a49d69e921a5a47437ed4dbfd71b0e2f0b1d' 
  AND token = '0ZQaM/JUgJ7qS8yieYRhdcxdTxVexU1pnF9aPDPug3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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