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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67fa15f5fde3860c13b48fe7141ef0e264a41e03778c4e3ab26580c951171a7' 
  AND token = 'sCoryLdUCY6LG52OMBVgy9oKcr4axRFsyV/ekAZm6Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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