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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61351c4926af5fb2919085ff155aa6f0078265d2ad2642b430dac75fbb62259' 
  AND token = '9LLotmie77ZrjPUsD62ykqeP4f3CihLIR8iGwj5QtDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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