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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169a31a948277edfc720da43d8cebddf894944e65f91be839a94aa637c2dce18' 
  AND token = 'HUue2hsxTeJjiNwQTw2p+myGXuRaw9VzshT/atU+vLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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