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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a51a034d4f62ad32779fa27c4aa6ceb36380da9c8a937c529aa09cfceb8b56' 
  AND token = '6uC8JF//pN+PVLVJ7eTma9hFMxnykK1YAllTIXPALy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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