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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc154de4e048faba2824bc31c21d40e7127b9f87b543ef4affc0b74c9a50429' 
  AND token = 'eklfd+ZgkqLCqEB9t+Ls9nhSz6Nw/scNdg5Y2KxdGzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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