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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439575a077886b852e143120bc9c432c041b6db1b7c7f96386588878b430f3a5' 
  AND token = 'NMcjh+ba+KmFX6feHf6uD+EVolQE7xxs0POGhqotWDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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