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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e69c630e97cd59f70acbc1b4f2453fd3319290f89ec8e7fd3d7822e5866885' 
  AND token = 'C4zOr91kFqXWEGy96rsoGcz4UoC7+SCEmpsmN3dwvgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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