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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1b3650fcd1fecffc4cc6f04cdfbd4c7f91c906e600b94709d81f8793ec5498' 
  AND token = '8cs9vnASVtAB98/g2LDuZV9EQtmKxboukP5ZLEXU+Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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