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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe2211531d8b34ea825d96753eb6c8b80596212a9b8ad11b27e560a0d868e02' 
  AND token = '2KUWdr3bePs2TBtuZbuoGXZZPzHaKKtSwy304JlZyTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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