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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e698a9e7bc2652c305a70c0fb9105d14405a0cbe3a90009ea82bfb2747603d' 
  AND token = 'BmYru/SxvmQL5uGnk1x5MjKkxDwM5Wl/1KO4+cvfy2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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